Adhesive and process of making the same



3 atmospheric or near atmospheric pressure out o temperature near 100 Patented Sept. 5, 1933 1,925,232 ADHESIVE AND mgcs'ss ormxmo 'rrm Morton B. Cooper,

Llnldale, Pa, assignor to Perkins Glue Company, a corporation of Dela- No Drawing. Application February 21, 1930 Serial No. 439,448

40mins.

This invention relates to adhesivs-moreparticularly to an dhesive employing casein in solution.

The usual alkaline casein glues do not possess highly waterproof characteristics. In addition such glues when employed in wood-working are more quickly absorbed by some woods with the result that where a, wood of each kind is employedin making a joint, one wood absorbs most oi the adhesive and the other absorbs very little, causing a weakened Joint because of the unequal penetration of the adhesives.

An important object 01' this invention accordingly is to provide casein adhesives having s.- higner waterproofness than the usual alkaline glues of this type. Another object of the invention is to provide glues of this type which may be used with woods having dlfierent absorptive chereoteristios, without causing above, and which therefore ly strong joints with such woods.

Qther objects and advantages will be apparent from the following description.

The, invention comprises the novel products as well as the novel processes and steps of processes according to which such products are manufactur d, the specific embodiments of which ore described hereinafter by wey of example and in word-once with which I now prefer to practice nvention. I ill accordance with my invention I have found by suitably prepared dried substen ly insoluble blood with casein a glue hevihs reissue-l we'tei orooiness and other desirable chesscteristics is obtained.

dried blood, which I prefer, may be pro= duced by evaporating blood-such as for example the blood of horses, cows, wholes, hogs, etc.et

C. The product is inlt appears in commerce under the home tilizer blood. it sliders from blood albumin, oh prepared blood under vacuum low this product being water o .e.

l have found that varying too proportions and degrees oi fertilizer blood may be out ed secure the results desired. The pro rtion oi"- casein and other ingredients may also ee varied. following is 2:. description of o composition which i: now prefersl employ to to 2o percent, preferably 14% of dried fertiliser blood, half of which hasbeen ground to pass a 100 mesh sieve, and the other of which has been ground to pass a 200 mesh than others the results mentioned will produce uniformsieve, in conjunction with 62% of a good commercial grade of casein or blends of same ground to pass a 60 mesh sieve, mixed with l5/ hydrated lime, 5% sodium fluoride and 3 9:, so-

dium phosphate. For convenience the above 80 composition is tabulated as follows:-

H arms Sodium Sodium mm m mm lime fluoride phosphate 65 02% 1o-2o% ruemb1y1i% 15.5% 3.5%

P883100 Pass200 mesh sieve mesh sieve These ingredients are mixed dry to form the glue base in solid form, and after thorough mixing two parts of Witter, preferably at room tempera-- ture, is sdded to one port of the mixture. The resulting mixture has a viscosity of about to which varies according to the blends of casein involved when tested by the Stormer viscosimeter. The glue so made may be applied by any oi. the 343 ordinary spreading machinery as is used in woodworking factories todoy; also it can be used where necessary with o coon hand brush.

noted the quantity of fertilizer blood may be varied but I prefer iii-213%. The quantity of casein may also very from 42 to 62%. Instead oi the ceseln solvents used, others may be employerl.

.l have found that when the composition mode as above is applied to o joint comprising porous w and non-porous wood-the glue produces 9. strong joint. The fertilizer blood causes less penetration into the more porous wood. The blood seems to swell end fill the pores of the letter and hinders the penetration by the remainder of the mass into these pores, slthough allowing sufficient penetration to form e, strong joint. This joint is stronger than when the blood is omitted. On. examining u joint mode in this way I have found that the penetration is quite even. I have found 1% that the coarser port of the fertilizer blood par= tielly remeins on the surface of the part being glued and when the wood is put under pressure loss of glue by being pressed out, is greatly less ened. An even glue line is thus also formed. In 1% addition when the composition is used under pressure, particularly with panels, the tendency of the veneer to slip when the usual pressure is applied, is greatly decreased when my compositlon is used. The mixture or fertilizer blood with m casein seems t prsclue-e a whisk efim wally resists this slippage.

The glue made in accordanse with the above has remarkable waterpraofinz propertiea. I have tested it according 1w the procedure for testing established by Fsrest Pmducts Laboratory and find in accordanm with abuse tests that it pass-asses higher waterprwfimg quaiitias than the same casein glue withaut fez-tfiizar blood.

What I claim and desire to sesame by Matters Patent $52- 1. A glue compr sing a glue or like and fertfllz-er Maui paflicies 11$ varying size, preventing excessive abssrptian "my the surmass 140 whisk it is wpIi-safi.

A casein 3111a pizeri for joimmg emf-aces 0:5 materials 115mm max-e212, ansoz'p'sfiz a meperties, wl'sicil compz'ises gins wmpcsitim cmmmmg Mos-d camwwfi m gartick E size to mrea of slu'iaw to be 3:311:26 preventing excessive absorptien 01! the glue by said amazes.

3. A casein glue adapted particularly for use on starved in comprising a water soluble casein camposition cantaining alkaline material tegether with water insoluble pariicls of fertilizer blood, the said particles being of varying aim and weaving to clog the pores in the surfaces to be mined, thus prevent ng absorptive action 0i the said; sin-Eases.

4.. A mac-sass for the preparatinm e2 gluza, which compmes gmtmimng' casein or the like with & glutinizmg agent, to produce 2. glam having swalling astionupon fertilizer bleed particles, mm combining with tha glutinized. material, fer:- islizer mm particles of varying size adapted to 010g the poms 0i surfaaes 130 be joined. by the glue precinct.

MORTGN B. 

